From Deng Lu, a mining planet, this planet suffers from heavy slavery and taxes under the will of God. In order to change the fate of the planet, my sister Qiu took part in the concave-convex contest three years ago and never returned. In order to find her sister and change the fate of her hometown planet, Jin found the path her sister had taken when she grew up and set foot on the journey of the concave-convex contest again.

On the other hand, seemingly cheerful Kim has always hidden the panic of loneliness. He knows that this terrible power is hidden in his body and is not under his control (referring to all blackening and semi-blackening). He doesn't know why that force was born, and he doesn't know when it will wake up and leave. He is afraid of being alone, and he is even more afraid that after having family and friends, he will be unable to control that terrible force to hurt them (fear of violence).